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Quality of Life Research
Gepubliceerd in:

01-04-2009

The 6-item CTS symptoms scale: a brief outcomes measure for carpal tunnel syndrome

Auteurs: Isam Atroshi, Per-Erik Lyrén, Christina Gummesson

Gepubliceerd in: Quality of Life Research | Uitgave 3/2009

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Abstract

Objective

To develop a psychometrically appropriate brief symptoms measure of carpal tunnel syndrome (CTS).

Methods

Preoperative CTS 11-item symptom severity and 8-item functional status scales from 693 patients (71% women) with CTS were subjected to exploratory factor analysis and item response theory (IRT) analysis yielding a revised CTS symptoms scale. A validation sample of 213 patients (68% women) with CTS completed the 11-item disabilities of the arm, shoulder and hand (QuickDASH), and the revised symptoms scale and 116 patients also completed the original CTS symptom severity scale (median interval 11 days).

Results

Of the 11 CTS symptom severity scale items, 2 items that on factor analysis associated with the functional status items were removed. After IRT recalibrations of the remaining symptom severity scale items, 2 non-fitting items were removed and 2 items were merged creating the 6-item CTS symptoms scale. Factor analysis showed one dominant factor explaining 58% of the variance. Reliability was high (Cronbach alpha = 0.86; IRT person separation reliability = 0.88). No item displayed significant differential item functioning. The 6-item CTS symptoms scale showed strong correlation with the QuickDASH (r = 0.70) and agreement with the original symptom severity scale (ICC = 0.80).

Conclusion

The 6-item CTS symptoms scale has good reliability and validity and can be used to measure symptom severity and treatment outcome in CTS.
vorige artikel Response shift: a brief overview and proposed research priorities
volgende artikel Measuring global physical health in children with cerebral palsy: illustration of a multidimensional bi-factor model and computerized adaptive testing
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Metagegevens
Titel
The 6-item CTS symptoms scale: a brief outcomes measure for carpal tunnel syndrome
Auteurs
Isam Atroshi
Per-Erik Lyrén
Christina Gummesson
Publicatiedatum
01-04-2009
Uitgeverij
Springer Netherlands
Gepubliceerd in
Quality of Life Research / Uitgave 3/2009
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-009-9449-3

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